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Fast glass
G'day, I am still learning photography and have a basic understanding of shutter speed and aperture, I understand that fast glass means smaller f numbers (larger aperture) and means the aperture will open wider to let in more light in less time thus reducing blur.
I hear all the time that for astrophotography you need fast glass....why?... from what I understand the main 'tool' for getting more detail is to leave the shutter open for longer periods of time.....wouldn't this negate the need for fast glass???
Peter
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